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Now showing items 1412-1431 of 1451

Vibration rotation bands of SiO in sunspots

Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1978)

The equivalent widths of P(51) and R(43) lines of the 1-0 and P(45) and R(56) lines of the 2-1 vibration rotation bands of SiO near 8 µm region, have computed for Zwaan's(1974) sunspots model at the centre of the disc. The ...
Vibration-rotation bands of HF, HBr and HI in the sunspot spectrum

Pande, M. C.; Gaur, V. P. (1974)

The calculated equivalent widths of R(7), R(9) and R(13) lines of 1-2 vibration-rotation band of HF for Henoux’s (1969) sunspot model suggest the presence of this band in sunspot spectrum. The reasons for the absence of ...
Viscous accretion disc around black holes with variable adiabatic index

Chattopadhyay, I.; Kumar, R. (ASI, 2013)

We study the viscous advective accretion disc around non- rotating black holes with variable adiabatic index. In this study we have developed all possible global accretion solutions e.g. Bondi type, smooth and shocked ...
Viscous dissipative two-temperature accretion flows around black holes

Sarkar, Shilpa; Chattopadhyay, Indranil (Journal of Astrophysics & Astronomy, 2022-12)

General relativistic, advective, viscous, two-temperature accretion disc solutions are studied around a Schwarzschild black hole. The thermodynamics of the flow is described by the relativistic equation of state or ...
VLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1: Analysis of two giants in HP-1

Barbuy, B.; Zoccali, M.; Ortolani, S.; Momany, Y.; Minniti, D.; Hill, V.; Renzini, A.; Rich, R. M.; Bica, E.; Pasquini, L.; Yadav, R. K. S. (2006)

Metal-poor globular clusters in the bulge are important tracers of early chemical evolution. HP-1 is among the six metal-poor clusters within 5º of the Galactic center, and could be the one closest to the center. The main ...
VVV DR1: The first data release of the Milky Way bulge and southern plane from the near-infrared ESO public survey VISTA variables in the Vía Láctea

Saito, R. K. et. al.; Sharma, Saurabh (2012)

Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started in 2010. VVV targets 562 sq. deg in the Galactic bulge and an adjacent plane region and is expected to run for about five years. Aims. We ...
Wave like signatures in aerosol optical depth and associated radiative impacts over the central Himalayan region

Shukla, K. K.; Phanikumar, D. V.; Kumar, K. N.; Reddy, K.; Kotamarthi, V. R.; Newsom, R. K.; Ouarda, T. B.M.J. (Elsevier, 2015)

Doppler Lidar and Multi Filter Rotating Shadow band Radiometer (MFRSR) observations are utilized to show wave like signatures in aerosol optical depth (AOD) during day time boundary layer evolution over the Himalayan region. ...
Wave minimum of AR Lacertae

Srivastava, R. K. (1986)

U, B and V observations of AR Lacertae, obtained in 1981, have been presented alongwith the colour indices. A distortion wave minimum is found to lie at 0.21. The amplitude of the wave minimum in V filter is too weak, ...
Waves-like signatures in the D-region ionosphere generated by solar flares

Maurya, Ajeet K.; Singh, R.; Kumar, S.; Phanikumar, D. V.; Veenadhari, B. (IEEE, 2014)

The present study reports presence of periodic Wave-Like Signatures (WLS) in the D-region ionosphere detected using NWC, Australia, VLF navigational transmitter signal (19.8 kHz) observed at Allahabad, an Indian low latitude ...
Weather Research and Forecasting Model with Chemistry (WRF-CHEM) over South Asia

Kumar, Rajesh (Max Planck Institute for Meteorology, Germany, 2012-06)

The Weather Research and Forecasting model with Chemistry (WRF-Chem) has been set-up and used for the first time to simulate the meteorology and air quality of South Asia during the year 2008. The model performance is ...
WEBT multiwavelength monitoring and XMM-Newton observations of BL Lacertae in 2007–2008 : Unveiling different emission components

Raiteri, C. M., ... et al. (including Gupta, A. C. and Sagar, R.) (2009)

BL Lacertae is the prototype of the blazar subclass named after it. Yet, it has occasionally shown a peculiar behaviour that has questioned a simple interpretation of its broad-band emission in terms of synchrotron plus ...
The whole earth blazar telescope campaign on the intermediate bl lac object 3C 66A in 2007-2008

Bottcher, M., ...et al. (including Gupta, A. C.) (2009-03-20)

ABSTRACT Prompted by a high optical state in 2007 September, the Whole Earth Blazar Telescope consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on the intermediate BL Lac object 3C ...
A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336−018 (NY Vir)

Kilkenny, D., ... et al. (including Joshi, S.) (2003)

We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) ...
Wide field CCD photometry of the young open cluster NGC 663

Pandey, A. K.; Upadhyay, K.; Ogura, K.; Sagar, R. (2003)

A deep and wide field CCD photometry of the young open cluster NGC 663 has been carried out. We report preliminary results of our investigations, specifically the determination of the cluster mass function which is found ...
Wide-field CCD photometry around nine open clusters

Sharma, S.; Pandey, A. K.; Ogura, K.; Mito, H.; Tarusawa, K.; Sagar, R. (2006-10)

In this paper we study the evolution of the core and corona of nine open clusters using the projected radial density profiles derived from homogeneous CCD photometric data obtained with the 105 cm Kiso Schmidt telescope. ...
Wintertime spatial characteristics of boundary layer aerosols over peninsular India

Moorthy, K. K., ...et al. (including Saha, A.) (2005-04-30)

During an intense field campaign for generating a spatial composite of aerosol characteristics over peninsular India, collocated measurements of the mass concentration and size distribution of near-surface aerosols were ...
Wolf-Rayet galaxies and their CCD photometry

Sanwal, B. B. (2001)

Galaxies with Wolf-Rayet star features in their spectra have long been konwn. They are characterised by a broad emission features at λ 4686 Å. This is attributed to stellar HeII emission from a large population of WR stars. ...
WRF-Chem simulations of a typical pre-monsoon dust storm in northern India: influences on aerosol optical properties and radiation budget

Kumar, R.; Barth, M. C.; Pfister, G. G.; Naja, M.; Brasseur, G. P. (The European Geosciences Union, 2014-10-03)

The impact of a typical pre-monsoon season (April–June) dust storm event on the regional aerosol opti- cal properties and radiation budget in northern India is an- alyzed. The dust storm event lasted from 17 to 22 ...
X-Ray and Optical Studies of Blazars

Gaur, Haritma (ARIES, Nainital, 2013-02)

Active Galactic Nuclei (AGN) are small regions in centers of some galaxies which emit powerful electromagnetic radiation, often outshining stars, gas, and dust which make up the host galaxy. These are the brightest ...
X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat

Kuznetsov, A. A.; Karakotov, R. R.; Chandrashekhar, K.; Banerjee, D. (Research in Astronomy and Astrophysics, 2023-01)

We present observations of the active M-dwarf binary AT Mic (dM4.5e+dM4.5e) obtained with the orbital observatory AstroSat. During 20 ks of observations, in the far-ultraviolet (130–180 nm) and soft X-ray (0.3–7 keV) spectral ...

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